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| author | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2013-02-11 11:06:33 +0000 |
|---|---|---|
| committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2013-02-11 11:06:33 +0000 |
| commit | e790245eb3b437bb1d322cf3d5fbb603a138c9f7 (patch) | |
| tree | 54469e8ec666cb4a03b541c218482f172b80bb24 /Documentation/devicetree | |
| parent | d289323286d6b4e738458c31533da51d294d28a0 (diff) | |
| parent | fd23fb9f6bfd43a6e62b2646d18d5ca3edc3ebe3 (diff) | |
Merge remote-tracking branch 'asoc/topic/cs4271' into asoc-next
Diffstat (limited to 'Documentation/devicetree')
| -rw-r--r-- | Documentation/devicetree/bindings/sound/cs4271.txt | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/sound/cs4271.txt b/Documentation/devicetree/bindings/sound/cs4271.txt index a850fb9c88ea..e2cd1d7539e5 100644 --- a/Documentation/devicetree/bindings/sound/cs4271.txt +++ b/Documentation/devicetree/bindings/sound/cs4271.txt @@ -20,6 +20,18 @@ Optional properties: !RESET pin - cirrus,amuteb-eq-bmutec: When given, the Codec's AMUTEB=BMUTEC flag is enabled. + - cirrus,enable-soft-reset: + The CS4271 requires its LRCLK and MCLK to be stable before its RESET + line is de-asserted. That also means that clocks cannot be changed + without putting the chip back into hardware reset, which also requires + a complete re-initialization of all registers. + + One (undocumented) workaround is to assert and de-assert the PDN bit + in the MODE2 register. This workaround can be enabled with this DT + property. + + Note that this is not needed in case the clocks are stable + throughout the entire runtime of the codec. Examples: |